[PATCH 1 of 4] color: fix grammar in help text

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1490462963 14400
#      Sat Mar 25 13:29:23 2017 -0400
# Node ID 22533c3af63d5a67d9210596eafd4b99ab9c7904
# Parent  c60091fa1426892552dd6c0dd4b9c49e3c3da045
color: fix grammar in help text

diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -7,7 +7,7 @@
 
 '''enable Mercurial color mode (DEPRECATED)
 
-This extensions enable Mercurial color mode. The feature is now directly
+This extension enables Mercurial color mode. The feature is now directly
 available in Mercurial core. You can access it using::
 
   [ui]